获取 java 异常：java.net.MalformedURLException：无协议
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getting java exception: java.net.MalformedURLException: no protocol
提问by Craig H
I am currently calling the following line of code:
我目前正在调用以下代码行：
java.net.URL connection_url = new java.net.URL("http://<ip address>:<port>/path");
and I get the exception above when it executes. Any ideas as to why this is happening?
我在执行时得到了上面的异常。关于为什么会发生这种情况的任何想法？
采纳答案by matt b
Your code works perfectly fine for me:
你的代码对我来说非常好：
public static void main(String[] args) {
try {
java.net.URL connection_url = new java.net.URL("http://:/path");
System.out.println("Instantiated new URL: " + connection_url);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
}
Instantiated new URL: http://:/path
实例化的新 URL：http://:/path
Sure you have the right line of code?
确定你有正确的代码行吗？
回答by jjnguy
回答by sblundy
That url string looks like it's invalid. Sure it's not supposed to be 'http://path'? Or are the server & port blank?
该 url 字符串看起来无效。确定它不应该是“ http://path”？或者服务器和端口是空的？
回答by Pavan
I have also had the same exception, but in my case the URL which I was trying to execute had a space appended. After removing the space it worked fine for me. Check that the URL does not have any trailing spaces in your case.
我也有同样的例外，但在我的情况下，我试图执行的 URL 附加了一个空格。删除空间后，它对我来说效果很好。检查 URL 是否在您的案例中没有任何尾随空格。
回答by Jyoti
I had the same error and it got resolved by the below :
我有同样的错误，它通过以下解决：
The jar files (JFree) which I added few days back got corrupted automatically and was causing this error. I downloaded the same files again from net and it worked fine for me.
我几天前添加的 jar 文件 (JFree) 自动损坏并导致此错误。我再次从网上下载了相同的文件，对我来说效果很好。
